Nanoheterostructure Cation Exchange: Anionic Framework Conservation

Journal Article · Tue May 11 04:00:00 EDT 2010 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja104126u· OSTI ID:984352

Jain, Prashant K; Amirav, Lilac; Aloni, Shaul; Alivisatos, A Paul

In ionic nanocrystals the cationic sub-lattice can be replaced with a different metal ion via a fast, simple, and reversible place-exchange, allowing post-synthetic modification of the composition of the nanocrystal, while preserving its size and shape. Here, we demonstrate for the first time that during such an exchange, the anionic framework of the crystal is preserved. When applied to nanoheterostructures, this phenomenon ensures that compositional interfaces within the heterostructure are conserved throughout the transformation. For instance, a morphology composed of a CdSe nanocrystal embedded in a CdS rod (CdSe/CdS) was exchanged to a PbSe/PbS nanorod via a Cu2Se/Cu2S structure. During every exchange cycle, the seed size and position within the nanorod were preserved, as evident by excitonic features, Z-contrast imaging, and elemental line-scans. Anionic framework conservation extends the domain of cation exchange to the design of more complex and unique nanostructures.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Materials Sciences Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 984352
• Report Number(s): LBNL-3477E
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
CATIONS
DESIGN
MODIFICATIONS
MORPHOLOGY
NANOSTRUCTURES
Nanorod
heterostructure
cation exchange
seeded rod
near-infrared
charge separation
SEEDS
SHAPE